/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.inlong.sort.iceberg.sink;

import org.apache.flink.core.io.SimpleVersionedSerializer;
import org.apache.iceberg.ManifestFile;
import org.apache.iceberg.ManifestFiles;
import org.apache.iceberg.relocated.com.google.common.base.Preconditions;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;

/**
 * Copy from iceberg-flink:iceberg-flink-1.15:1.3.1
 */
class DeltaManifestsSerializer implements SimpleVersionedSerializer<DeltaManifests> {

    private static final int VERSION_1 = 1;
    private static final int VERSION_2 = 2;
    private static final byte[] EMPTY_BINARY = new byte[0];

    static final DeltaManifestsSerializer INSTANCE = new DeltaManifestsSerializer();

    @Override
    public int getVersion() {
        return VERSION_2;
    }

    @Override
    public byte[] serialize(DeltaManifests deltaManifests) throws IOException {
        Preconditions.checkNotNull(
                deltaManifests, "DeltaManifests to be serialized should not be null");

        ByteArrayOutputStream binaryOut = new ByteArrayOutputStream();
        DataOutputStream out = new DataOutputStream(binaryOut);

        byte[] dataManifestBinary = EMPTY_BINARY;
        if (deltaManifests.dataManifest() != null) {
            dataManifestBinary = ManifestFiles.encode(deltaManifests.dataManifest());
        }

        out.writeInt(dataManifestBinary.length);
        out.write(dataManifestBinary);

        byte[] deleteManifestBinary = EMPTY_BINARY;
        if (deltaManifests.deleteManifest() != null) {
            deleteManifestBinary = ManifestFiles.encode(deltaManifests.deleteManifest());
        }

        out.writeInt(deleteManifestBinary.length);
        out.write(deleteManifestBinary);

        CharSequence[] referencedDataFiles = deltaManifests.referencedDataFiles();
        out.writeInt(referencedDataFiles.length);
        for (CharSequence referencedDataFile : referencedDataFiles) {
            out.writeUTF(referencedDataFile.toString());
        }

        return binaryOut.toByteArray();
    }

    @Override
    public DeltaManifests deserialize(int version, byte[] serialized) throws IOException {
        if (version == VERSION_1) {
            return deserializeV1(serialized);
        } else if (version == VERSION_2) {
            return deserializeV2(serialized);
        } else {
            throw new RuntimeException("Unknown serialize version: " + version);
        }
    }

    private DeltaManifests deserializeV1(byte[] serialized) throws IOException {
        return new DeltaManifests(ManifestFiles.decode(serialized), null);
    }

    private DeltaManifests deserializeV2(byte[] serialized) throws IOException {
        ManifestFile dataManifest = null;
        ManifestFile deleteManifest = null;

        ByteArrayInputStream binaryIn = new ByteArrayInputStream(serialized);
        DataInputStream in = new DataInputStream(binaryIn);

        int dataManifestSize = in.readInt();
        if (dataManifestSize > 0) {
            byte[] dataManifestBinary = new byte[dataManifestSize];
            Preconditions.checkState(in.read(dataManifestBinary) == dataManifestSize);

            dataManifest = ManifestFiles.decode(dataManifestBinary);
        }

        int deleteManifestSize = in.readInt();
        if (deleteManifestSize > 0) {
            byte[] deleteManifestBinary = new byte[deleteManifestSize];
            Preconditions.checkState(in.read(deleteManifestBinary) == deleteManifestSize);

            deleteManifest = ManifestFiles.decode(deleteManifestBinary);
        }

        int referenceDataFileNum = in.readInt();
        CharSequence[] referencedDataFiles = new CharSequence[referenceDataFileNum];
        for (int i = 0; i < referenceDataFileNum; i++) {
            referencedDataFiles[i] = in.readUTF();
        }

        return new DeltaManifests(dataManifest, deleteManifest, referencedDataFiles);
    }
}
